Typewriting machine



Jan. 19 1926.

G. w. CAMPBELL TYPEWRITING' MACHINE Original Filed May 10, 1922 2 Sheets-$116M: 1

bra/en for;

Affarn 'lillllllllllll1111111111111 G. W. CAMPBELL TYPEWRITING MACHINE "-Jan. 19

z Sheets-Sheet 2 Original Filed May 10. 1922 Patented Jan. 19, 1926.

UNITED STATES PATENT OFFICE.

GEORGE W. CAMPBELL, OF HARTFORD, CONNECTICUT, ASSIGNOR TO UNDERWOOD TYPEWRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

TYPEWRITING MACHINE.

Application filed May 10, 1922, Serial No. 559,693.

To all whom it may camera:

Be it known that I, Gnonon 1V. CAMPBELL,

a citizen of the United States, residing in lI-l artforchin the county of Hartford and I State of Connecticut, have invented certain new and useful Improvements in Typewriting Machines, of which the following is a specification.

The present invention relates to sounddeadening casings for typewriting machines; and more particularly to the type of easing into which the machine is inserted from the top; the casing having a cover which may be opened to permit of placement and re: moval of the machine, and to permit of access to the machine for erasures and other purposes. Casings of the character mentioned have been provided with spring-devices for assisting in opening the casingcover; also with adjustable means for locating the rear feet of the machine; and with various means for holding lining-sheets of sound-deadening material in place.

An object of the invention is the provi- 25 sion of a spring-device, for automatically swinging open the casing-cover, around pivots at the rear of the casing, whenever the cover is unlocked; such spring-device being adjustable as to the tension thereof, to accord to the weight and leverage involved; also to accord to variable frictional resistance at the casing-joints; and to accord to the action of a butter combined therewith to prevent shocks in the cover-opening operation.

A furtl'ier provision of an adjustable foot-locator for thcn'iachine, of cheap and simple construction, easily set to the casing, and, which, -when so set, will not be accidentally deranged or disjointed either in handling of ,the casing, insertion of the machine, or manipulation to adjust the same. In the form of the invention, hereinafter described in detail, the locator is a single, somewhat flexible sheetanetal stamping, pivotally secured at one end to the rear wall of the casing,

whereby it may be swung out of the way, and having means at its other end for looking it against movement after it is in place against the foot of the machine.

Another feature of the invention is the provision on the lower edge of theorisingbody, preferably as part of a casting formobject of the invention is the Renewed June 16, 1925.

ing the casing-body, of a peripherally-extending rib or flange forming with the wall of the casing a channel in which the lower edges of sheets of sound-deadening liningmaterial may be held against displacement.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is a view, in cross-sectional side elevation, through the casing; the machine being indicated in dot-and-dash lines therein.

Figure 2 is a broken view, in cross-sectional side elevation, of the casing, partly open, and showing the cover-opening device.

Figure 3 is a top plan view of the casingbody; the casing cover being shown, in part, at the lefthand side, to illustrate the connection thereto of the cover-opening device, which latter as well as the rear feet-locators and lining-holder are shown in detail.

The casing is shown as comprising two principal castings, one of which 10 constitutes the body of the casing, and the other of which 11 constitutes a cover hinged at 12 to the body-portion. The body and cover castingshave linings 14 and 15, respectively, of sound-deadening material. The bodyportion of the casing is shown as having a floor or bottom 16, of sound-deadening material, secured to the casting in any suitable manner, as by means of screws 17. The cover of the casing is provided with a windowpane 18, of glass or other transparent material, to permit the operator to observe the printing effected within the casing. The pane 18 is held in an opening in the covercasting in any suitable manner.

The machine 19 within the casing is provided with the usualfront feet 20 and rear feet 21. The keyboard-extension 22 of the machine projects through a suitable opening 23 in the front wall 24: of the casing-body. The typewriter-carriage 25 is mounted to have letter-feed and return movements on the main frame of the machine, and has mountedthereon a carriage-release-lever 26, a line-space lever 27, and a carriage-return arm 28. In Figure 1, these levers are shown as projecting to the outside of the front wall of the casing, so as to be accessible to the operator. Since these levers must move with the carriage, the front wall of the casino; must be slotted horizontally and longitudinally thereof. In Figure 1, this slot is shown at 29 as formed by a head 30 on the forward lower edge of the cover and by a bead 31 on the upper edge of the front wall 24 of the casing-body. The slot 29 is, however, practically closed by two resilient, flexible cushions 2'32 and 33; the cushion 32 being attached to the head 30 on the cover, and the cushion 33 being attached to the bead 31 on the trout wall of the easing-body. The cushions, in eti'eet, close the slot 529, being in contact with each other except where the levers 2ti 'JT and 3S protrude between the same. The ieldable, flexible character of the cushions permits movement: of the levers therealong as the carriage is moved in one or the other direction.

When the casing-cover is open, the typewriting machine may be inserted into the casing through the open top of the casingbody. In the form of the casing shown, the typewriter is inserted with its keyboard extension tilted downward and forward. 'lhus tilted, the lteylgmardextension is passed through the hole or opening 23 in the front wall 2st: 01' the casing; the side plates of the main frame of the typewriting machine being received in slots (not shown) in a crosspieee 3H1 of the easing-body below the keyboard. The keyboardextension is brought forward through the opening 2 and the trout oi the machine lowered until the front feet it) thereof enter recesses in locators 35, which are shown in Figure 3 as horizontal lugs forming partof the casting of the easing-body. The recesses in the locators 35 are curved in conformit with the curvature oil the front feet 20.

After the feet 20 are centered in the 10- cators 35. the rear of the machine is lowered to bring the rear -iteet 21 to rest on the basepiece 16. Vhen the rear feet 21 are thus seated on the base 16, they should tind themselves in recesses 36 (see Figure of loeatori-5 at the rear of the casing. In Figures it and 3, the loeator oi the present invention is shown as an abutment in the form o'l a sheet metal, somewhat resilient, strip 37, curled at the rear end to embrace a pin 38. The pin $138 is threaded at its bottom, at 39, to screw into a lug it), forming part of the casting of the casing-body: and is provided with a slotted head 42, which serves to hold down the aluit]nentarunnber 237. At its other end, the member l? carries a pin ll"), which passes through a slot H in a lug 4-5, which projects inward from the side wall of the casingl'iodv and is part oi? the body-casting. The pin 4%; is threaded to receive a thumb'nut 4-6, which, when tightened against the side ot the lug 45, serves to hold the locator 37 a 'ainst movement. IVhen the nut 4:6 is loosrned, the locator may be swung on the pin 38 as a pivot, and, being somewhat resilient, may be moved laterally along the rear face of the lug ll"). This movement or play of the locator permits the recessed f0ot-ho1ding part thereof to be adjusted laterally to IXCCOl'lllIlOtltltG and engage the correspomling foot of the typewriting machine. \Vhen such adjustment is etl'eeted, the thumb-nut it; is tightened to hold the locator in correct position.

In practice, the thumb-nuts 4e may be loosened or swung out of the way before the machine is inserted. After the correct positions for the rear feet; of the machine have been determined by the engagement of the front feet of the machine with the front locators, the rear loeators are moved by hand into engagement with the. rear feet, and the nuts to then tightened. it it is found, in lowering the rear ol the machine, that the rear 'leet strike the top of the rear locators, these ma first be moved out laterally, to permit the rear feet of the machine to he set down upon the base-piece It, and then the may be moved laterally inward to engage and hold the feet.

The lower edge oi the casting, forming the casingbody, has termed thereon, entirel v around its periphery, a flange which is first directed inwardly, as at 47, and then upwardly, as at 48, to form a channel, in which the lower edges of the lining-pieces ll of the casing-body may be set; and by means of which such lining-pieces are held againstdisplacement when so set. In Figure 1, the rear lining-member it is shown in position in the channel formed by the peripheral flange or rail 1-8; and, in Figure 3, one of the front lining-members l-l shown as extended down along the floor of the lefthand overhang fit) into its retaining channel at the bottom of the casing-body. The overhanging portions of the casing'bod v are for the well-known purpose of providing space for moven'ient oi the carriage on the.

machine: and, for the same XHISUI], the cover i (it the width represential by the overhangs 5U, rather than of the width represented by the lower portion of the easmg-lmdy, which has only to accommodate the stationary frame of the tyj'iewriting machine.

For causing the cover automatically to open, when free to do so, there provided a spring-device consisting of an arm 51, pivoted on a bolt 59, one end of which bolt is fixed in an car 53. formed on the casting 10, the other end of which is fixed in a recess in the end wall of the casting 10. The ear 53 projects through a cut in the rear lining member 1- and the bolt passes through a hole in the end lining-meml'ier 14. The arm has an elongated slot 54; therein, and through this slot projects a roller carried on a shouldered, screw 56, which is threaded into a boss 77, formed on the end wall ot the cr'n'er-casting 11. Because of the shoulder in the screw S6, the roller 55 ill) loo

sleeve 63 is a coiled spring 6 1, one end 65 of which passes through a hole in the lug or car 53 in the rear wall of the body-casting,

. and is thus anchored to the body of the casing.

The other end 66 of the spring 64 enters and is held in a recess in the collar 61. The spring 64: tends to urge the collar 61 toward the arm to cause the opposing teeth (11 these two elements to engage one another and to remain in engagement. The teeth thus in engagement with each other are so directed that there is no tendency of the collar 61 to cam itself out of engagement with the arm 51 under the action of the spring 64. To properly tension the spring 64, the collar 61 may be rotated by a tool, which may be inserted in holes 62. To enable the rotation of the collar by the tool, it is slidable longitudinally on the bolt 52, so that the teeth of said collar may slip by the teeth of the arm 51. By so regulating the tension of the spring, a sufficient force, properly to open the cover, may be obtained; and, on the other hand, the cover may be prevented from opening too violently.

When the arm 51 swings upward and rearward under the tension of the spring 64, it carries the cover with it, by reason of the engagement of the pin and roller, 56 and 55, in the slot 54 in the arm. As the cover swings open, the pin and roller move toward the distal end of the arm. The ends of the slot 54 may serve as stops to determine the open and closed positions of the cover.

A. shock-absorber is provided to prevent shocks on the hinges and other parts of the casing when the cover opens under the ac tion of the spring 64. The shock-absorber consists of a cylindrical extension 67 on the distal end of the arm 51, in which cylinder a piston 68 on a pin or shaft 69 is adapted to move. Within the cylinder 67 is a coiled spring 70, one end of which has bearing upon a stud 71, and the other end of which bears upon the piston 68. In Figure '1, the piston 68 is shown as seated against oneend of the cylinder 67, and the spring 70 is shown as slack. The pin 69 passes through the end of the cylinder 67 and into the slot 54, where it lies in the path of the roller 55. hen the cover is opened. the roller 55 passes along the slot 54 until it engages the end of the pin 69 and starts to compress the spring 70. From this point on, the spring 70 acts as a buffer, its resisting force in creasing as it is compressed by the piston 68. The stud 71, against which the spring 70 bears, is threaded, so that, by turning the same, the tension of the spring 70 and strength of the buffer may be regulated.

For locking the cover against the action of the spring-device, just referred to, there is pivoted at 72, to one of the side walls of the cover, a hook 73, which depends into the body-part of the casing. When the cover is shut andthe hook 73 is swung forward, it engages a detent 74, carried by the casing-body. Mounted to he slid rearward and forward in the front wall of the casingbody is a pin 75, carrying on its outer end a linger-piece 76, and having on its inner end a head 77, adapted to engage the end of the hook 7 3. \Vhen thekey or finger-piece 76 is pressed rearward, the pin disengages the hook from the detent 74 and releases the cover to the action of the opening device, heretofore described. A sleeve 78, mounted in the casing front wall, serves as a hardened bearing for the pin 75. This is employed because the material of the casing itself may not be hard enough to prevent undue Wear by the pin 75; and such wear might cause the pin to become loose and inaccurate in its action.

In order that the jured by the typewriting machine, in the operation of removing the latter from the casing, and may not be struck by the operahook may not be intor, or otherwise be bent or injured, it is set in a housing. This housing is in two sections, one section 80 being on the cover, and the other section 81, which forms a continuation of the section 80, being on the casing body. As shown in Figure 1, the housing 80 is of U-shaped sheet-metal, closed at the top,

and the housing 81 is likewise in the form of a U-shaped piece of sheet-metal, open at the top and closed at the bottom by the offset side wall 50 of the body-portion of the casing. Within the housing 80 on the corer is also a leaf-spring 83, which bears against the rear of thehook 73 and against the rear wall of the housing, and thus tends to throw the hook 7 3 forward into covei-locking position. The normal position of the hook 7 3 is therefore a forward position; and, in order thatthe hook may not interfere with the closing of the cover, the upper forward edge of the housing 81 on the casing-body is slightly bent out, as at 84, to form a cam,

The head 77 on the' the hook, but also serves as a shoulder to prevent the pin from being ejected forward out of the casing-wall by the spring-action oi. the book 73, and from falling out when the casing is tilted. The front and rear. walls of the housing ma serve as stops to limit the throw of the hook.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim:

1. In combination with a sound-deadening casing for a typewriting machine having sound-sealing relations with certain parts of the machine to permit operation of the machine by parts thereof projecting to the outside of the casing, means for locating the feet of the machine to maintain such sound-sealing relations, said locating means comprising a bar pivoted at one end to the casing, and means for locking the bar.

2. In combination with a souml-deadening casing for a typewriting machine having sound-sealing relations with certain parts of the machine to permit operation of the machine by parts thereof projecting to the. outside of the casing. means for adjustably locating the feet of the machine to ma ntain such sound-sealing relations said locating means con'iprising a device pivoted to the casing, and having means for locking the same in different positions to which it may be set.

3. In combination with a sound-deadening casing for a typewriting machine having sound-sealing relations with certain parts of the machine to permit operation of the machine by parts thereof projecting to the outside of the casing, means for locating the feet of the machine to maintain such soundsealing relations, said locating means comprising a pair of pivoted bars, recessed to receive corresponding feet of the maeluire means for securing the same against said feet, and locating means for the remaining feet.

4. In combinationwith a. sound-deadening casing for a typewriting machine hav ing ound-sealing relations with certain parts of the machine to permit operation of the machine by parts thereof projecting to the outside of the casing, means for locating the feet of the machine to maintain such sound-sealing relations, said locating means con'i 'i ising a bar pivoted at one end to the casing and at its other end having a pinand-slot engagement with a lug on the easing, and means for anchoring the bar with the pin in any desired adjusted position lengthwise of said slot.

5. In combination with a sound-deadening casing for a typewriting machine having sonnd-sealing relations with certain parts of the machine to permit operation of the machine by parts thereof projecting to the outside of the casing, means for locating the feet of the machine to maintain such sound-sealing relations, said locating means con'i 'irising a bar of substantially right-angular forn'iation, pivoted at one end to the rear of the casing and having its other end adjustablv secured to the side of the 'asi'ng.

t. In combination with a sound-lileadening casing for a typewriting machine having sound-sealing relations with certain parts of the machine to permit operation of the machine by parts thereof projecting to the outside of the casing, means for locating the feet. of the machine to maintain such soundsealing relations, said locating means com' prising a. strip pivoted at one end to the casing, a lug on the casing, and means for securing the other end of the strip to said lug.

T. In combination with a souml-deadcning casing for a typewriting machine having sound-sealing relations with certain parts of the machine to permit operation of the machine by parts thereof projecting to the outside of the casing, means for locating the feet of the machine to maintain such soundseal'ing relations, said locating means comprising a strip of resilient sheet-metal material of substantially right-angular formation, pivoted at one end rearward oi the casing, av bracket extending laterally ot' the casing, against which the other end of the strip is adapted to bear. a pi11-and-slot connection liiet-wecn the bracket and the strip, means 'for securing the strip to the bracket in any desired setting of the pin along the slot, and a recess in. the strip to receive the side of the foot of the machine.

8. The combination with a casing for a. typewriting machine, of a lining-sheet of sound-deadening material for the, casing. and a stiffening integral rib or flange on the interior of the casing and extending a round its sides and back and turned up at its inner edge and forming with the wall of the casing a channel receiving and holding the lower edge of the lining-sheet.

9. The combination with a diearasiing forming a four-sided casingbod tor a type writing machine, of a sheet of sonrid-deadening lininganaterial therefor, and an internal flange or rib forming part of the casting, extending peripherally therealong on all sides of the base thereof, and having a turned-up inner lip and forming with the wall of the casting a u shaped channel into which one edge of the lining-sheet is compressed and therelrv held.

10. In a sound-deiulening casing for a typewriting machine having a frame. supporting feet at the corners of the frame, a carriage and an operating finger-piece pro jecting from the carriage, said casing having a. slot along which said fingcr-piece trav'; els with the carriage, and lined means to to operate with the front feet to position the machine to avoid interference with the op eration of the finger-piece int-he slot; means for engaging the rear feet to hold the front feet in engagement with said tired means, and comprising for each rear foot a lag projecting forwardly from the rear wall of the cas ing, a bracket having a rear arm pivoted on said lug to swing horizontally, a concave portion to receive the adjacent foot and a lateral arm, a lug on the side wall adjacent said laterai arm, and means to clamp said lateral arm to the second-mentioned lug in adjusted position.

11. In a casing for a typewriting machine, a body comprising a die-casting having a flange or rib extending peripherally thereof at the base and forming with the inner face of the wall of the casing a channel to receive the lower edge of a lining-sheet of sound-deadening i'naterial, and lugs extend ing inwardly from the rib at the sides and at rear to provide means for attaching locators for the rear feet of the machine.

12. In a casing for a typewriting machine, a body comprising a die-casting having a flange or rib extending peripherally thereof at the base and forming with the inner face of the wall of the casing a channel to receive the lower edge of a liningsheet of sound-deadening material, and lugs extending inwardly from the rib at the sides and at the rear to provide means for attaching locators for the rear feet of the ma chine, said lugs being flat, those on the side walls lying in a vertical plane, and those on the rear wall lying in a horizontal plane extending through the lower parts of the lugs on the side walls.

13. In a sound-deadening casing for a typewriting machine, a base, and a bodyportion formed of a die-casting having at its lower edge a continuous rib turned inwardly and upwardly to form with the wall of the casing a channel to receive one edge of a lining of sound-deadening material, and having a groove on the bottom thereof to receive the edges of the base.

l l. In combination with a sound-deadening casing for a typewriting machine l1aving sound-sealing relations with certain partsof the machine to permit operation of the machine by parts thereof projecting to the outside of the casing, said casing having fixed locators for the front feet of the machine, and also having a rear fixed wall, and independently adjustable locators mounted on said rear fixed wall and cooperative with each other for the rear feet of the machine, and releasable means for fastening the movable locators.

15. In a casing for a typewriting machine, a body comprising a die-casting having a flange or rib extending peripherally thereof at the base and forming with the inner face of the: wall of the casing a chair nel, said body including sides and a back and also including a front wall rising under the keylevers of themachine, and said rib extending entirely around said back and front wall and said sides, and a linin sheet of sound'deadening material set down into said channel.

16. In a sounddeadening casing for a typewriting machine having a body-part with an open top through which the ma chine may be placed into the casing, said casing, having a front wall, and a fixed rear wall, locators on said front wall to engage the front feet of the machine to locate the machine within the casing when it is moved forwardly in said casing against said locators, a set of adjustable devices upon said rear fixed wall and independently operable after the machine has been located to engage the rear feet to hold the machine against accidental displacement within the casing, and individual means to lock the holding devices in effective position.

17. In a sound-deadening casing for a typewriting machine having body-part with an open top through which the machine may be placed into the casing, said body-part having a front wall, side walls and a rear wall, locators on said front wall to engage the front of the machine to locate the machine within the casing when it is moved forwardly in said casing against said locators, devices pivoted on the rear wall and swingable inwardly after the machine has been located to engage the rear of the machine to hold said'machine against accidental displacement within the casing, and devices on said side walls to lock the hold ing devices in their effective positions.

18. In a sound-deadening casing for a typewriting machine having a body-part with an open top through which the machine may be placed into the casing, said body-part having a front wall, locators on said front wall to engage the front feet of the machine to locate the machine Within the casing when it is moved forwardly in said casing against said locators, two L shaped holding devices, each having a substantially slanted corner, said holding dcvices being pivoted on the casing and be hind the rear feet of the machine, so that they may be swung inwardly against the rear feet and accommodate themselves to the positions of the rear feet by means of theirslanted corners, and devices on the easing and at the sides of said rear feet to lock said holding devices in their holding positions.

19. In asound-deadening casing for a typewriting machine having a body-part with an opentop through which the machine may he placed into said casing, said after the machine has been located to engage casing having a front Wall, semicircular the rear feet of the machine to hold said locators on said front wall to engage the machine against accidental displacement 10 feet of the machine to locate the machine Within the casing, and means to lock the Within the casing when it is moved forholding devices in their effective positions.

wardly in said casing against said locators, articulated holding devices swingable GEORGE W. CAMPBELL. 

